from flask import Flask
from flask import g
from flask import render_template

from config import config
from flask_sqlalchemy import SQLAlchemy
from redis import StrictRedis

from flask_wtf.csrf import CSRFProtect, generate_csrf
from flask_session import Session
import logging
from logging.handlers import RotatingFileHandler

from info.utils.common import do_index_class, user_login

db = SQLAlchemy()


def set_log(config_name):
    # 设置日志的记录等级
    logging.basicConfig(level=config[config_name].LOG_LEVEL) # 调试debug级
    # 创建日志记录器，指明日志保存的路径、每个日志文件的最大大小、保存的日志文件个数上限
    file_log_handler = RotatingFileHandler("logs/log", maxBytes=1024*1024*100, backupCount=10)
    # 创建日志记录的格式 日志等级 输入日志信息的文件名 行数 日志信息
    formatter = logging.Formatter('%(levelname)s %(filename)s:%(lineno)d %(message)s')
    # 为刚创建的日志记录器设置日志记录格式
    file_log_handler.setFormatter(formatter)
    # 为全局的日志工具对象（flask app使用的）添加日志记录器
    logging.getLogger().addHandler(file_log_handler)


redis_store = None #type:StrictRedis

def create_app(config_name):
    set_log(config_name)
    app= Flask(__name__)
    app.config.from_object(config[config_name])
    # db = SQLAlchemy(app)
    db.init_app(app)
    global redis_store

    redis_store = StrictRedis(host=config[config_name].REDIS_HOST, port=config[config_name].REDIS_PORT,decode_responses=True)

    @app.after_request
    def after_request(response):
        # 调用函数生成 csrf_token
        csrf_token = generate_csrf()
        # 通过 cookie 将值传给前端
        response.set_cookie("csrf_token", csrf_token)
        return response


    @app.errorhandler(404)
    @user_login
    def get_404_error(e):
        data ={
            "user_info": g.user.to_dict() if g.user else None
        }
        return render_template("news/404.html", data = data)
    CSRFProtect(app)


    Session(app)
    app.add_template_filter(do_index_class, "index_class")

    from info.modules.index import index_blu
    app.register_blueprint(index_blu)
    from info.modules.passport import passport_blu
    app.register_blueprint(passport_blu)

    from info.modules.news import news_blu
    app.register_blueprint(news_blu)
    from info.modules.profile import profile_blu
    app.register_blueprint(profile_blu)
    from info.modules.admin import admin_blu
    app.register_blueprint(admin_blu)


    return app


